I've been trying to deploy the Advance Agent to several remote unmanaged machines, I already deployed the agent to one of them and copied the EXE to the ldlogon folder. However, after deploying the MSI to the rest of the machines, the log keeps sending "Discovery failed for ldlogon\Agent.exe, unable to fing allowed source (or peer depending on settings)".

I'm only deploying through peer because the link to the Core server is very slow.

My FW policy is very strict, however I already opened ports 9595 and 33354, that theoretically would be the required ones to have opened.

Yup, several times, the agent gets succesfully deployed to the first machine downloading from Source (Core Server), but after creating the Peer version of the Advance Agent and putting it in the ldlogon folder of said machine, the rest of the machines in the subnet keep sending the "Discovery failed for..." message.